Passionate application developer

Crash

Since the release of one of my UWP apps, the top crash was hang_quiesce.

Clicking on this failure, I was in confronted by a sea of nothing. I.E. nothing meaningful from my app and all Windows code.

I did a little survey among other UWP developers and some of them also confessed that this crash was quite common. It is good practice to fix crashes because if you have a high number of crashes, it affects the search ranking in the Microsoft Store.

I reached out to my friends at Microsoft. Stefan Wick was kind enough to tell me the possible causes: the app is hung or it forgot to release the deferral. Also, Brandon Paddock suggested a solution to the deferral issue: add the notion of duration of the App.OnSuspending event to force quit the execution after X time.

Note: I don’t know exactly how long the OS gives to the deferral before it takes the execution as hanging. This is probably not a good idea to do tons of database operations for example.

My simple solution was to introduce a delay task of 2 seconds and used Task.WhenAny to make sure that that either the Delay or Suspend method finishes before 2 seconds. For my app, it is not crucial if the Suspend method does not finish.

After one month, I was pleased to see this crash at 1.44% instead of 22%!

I don’t guarantee that your “hang_quiesce” issue will be the same as mine, but it is definitely worth a try.